LOCATION FARVA OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Haploxerepts
TYPICAL PEDON: Farva very cobbly loam, forested. (Colors are for moist soil unless otherwise noted.)
O--1/2 inches to 0; litter from needles, leaves and twigs.
A--0 to 5 inches; dark brown (7.5YR 3/2) very cobbly loam, brown (10YR 4/3) dry; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; common medium and fine roots; many irregular pores; 25 percent cobbles; 20 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (3 to 8 inches thick)
AB--5 to 12 inches; dark brown (7.5YR 3/4) very cobbly loam, brown (7.5YR 4/4) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common medium and fine roots; many irregular pores; 25 percent cobbles, 20 percent gravel, 10 percent stones; slightly acid (pH 6.3); gradual wavy boundary. (0 to 10 inches thick)
Bw--12 to 27 inches; brown (7.5YR 4/4) extremely cobbly loam, brown (7.5YR 5/4) dry; weak medium and fine subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; few fine, medium and coarse roots; many fine tubular pores; 25 percent cobbles, 25 percent gravel, 15 percent stones; slightly acid (pH 6.2); gradual wavy boundary. (10 to 30 inches thick)
C--27 to 35 inches; brown (7.5YR 4/4) extremely cobbly loam, brown (7.5YR 5/4) dry; massive; soft, very friable, nonsticky and nonplastic; few medium and coarse roots; many irregular pores; 35 percent cobbles, 20 percent gravel, 10 percent stones; moderately acid (pH 5.8); abrupt wavy boundary. (0 to 10 inches thick)
2Cr--35 inches; partially weathered andesitic bedrock.
TYPE LOCATION: Jackson County, Oregon; 0.3 mile north of Hyatt Lake, 1,850 feet south and 700 feet east of the northwest corner of sec. 11, T. 39 S., R. 3 E., Willamette Meridian.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact is 20 to 40 inches. The particle-size control section averages 45 to 80 percent rock fragments, of which 5 to 20 percent are stones, 25 to 35 percent are cobbles, and 15 to 25 percent are gravel and it is 15 to 25 percent clay. The mean annual soil temperature is 42 to 47 degrees F. The soil is usually moist, but is dry between 4 and 12 inches for 45 to 60 consecutive days or more in the four months following the summer solstice.
The A horizon has hue of 5YR, 7.5YR, or 10YR, value of 3 through 5 moist and 4 or 5 dry, and chroma of 2 through 4 moist and dry.
The B and C horizons have hue of 5YR or 7.5YR, value of 3 or 4 moist and 4 or 5 dry, and chroma of 3 or 4 moist and dry. It is extremely cobbly loam, or very cobbly loam.
COMPETING SERIES: These are the Ardenvoir, Blinn, Daxty, Jumpe, Lostbasin, Segundo and Thout series. Ardenvoir, Jumpe and Segundo soils are over 40 inches deep. Daxty, Lostbasin and Thout soils are moderately deep to a lithic contact.
GEOGRAPHIC SETTING: Farva soils are on mountains at elevations of 3,600 to 6,100 feet. Slopes are 3 to 70 percent. The soils formed in colluvium weathered from andesite, tuffs and breccias. The mean annual temperature is 40 to 45 degrees F. The mean annual precipitation is 30 to 55 inches. The frost-free period is less than 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bybee, Kanutchan, Pinehurst, Sibannac and Tatouche soils. Bybee, Kanutchan, and Tatouche soils are deep and fine. Sibannac soils are deep and poorly drained. The Pinehurst soils are fine-loamy, have a mollic epipedon over 20 inches thick and have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; medium and rapid runoff; moderately rapid permeability.
USE AND VEGETATION: Soils are used for timber production, grazing, water supply, recreation, and wildlife. Native vegetation dominantly is white fir, Douglas fir, shrubs, grasses, and forbs.
DISTRIBUTION AND EXTENT: Southern Cascades of southwestern Oregon. The soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Jackson County Area, Oregon, 1988.